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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.*/
/*
* Manifest obtainer frame script implementation of:
* http://www.w3.org/TR/appmanifest/#obtaining
*
* It searches a top-level browsing context for
* a <link rel=manifest> element. Then fetches
* and processes the linked manifest.
*
* BUG: https://bugzilla.mozilla.org/show_bug.cgi?id=1083410
*/
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
ManifestFinder: "resource://gre/modules/ManifestFinder.sys.mjs",
ManifestIcons: "resource://gre/modules/ManifestIcons.sys.mjs",
ManifestObtainer: "resource://gre/modules/ManifestObtainer.sys.mjs",
});
export class ManifestMessagesChild extends JSWindowActorChild {
receiveMessage(message) {
switch (message.name) {
case "DOM:WebManifest:hasManifestLink":
return this.hasManifestLink();
case "DOM:ManifestObtainer:Obtain":
return this.obtainManifest(message.data);
case "DOM:WebManifest:fetchIcon":
return this.fetchIcon(message);
}
return undefined;
}
/**
* Check if the document includes a link to a web manifest.
*/
hasManifestLink() {
const response = makeMsgResponse();
response.result = lazy.ManifestFinder.contentHasManifestLink(
this.contentWindow
);
response.success = true;
return response;
}
/**
* Asynchronously obtains a web manifest from this window by using the
* ManifestObtainer and returns the result.
* @param {Object} checkConformance True if spec conformance messages should be collected.
*/
async obtainManifest(options) {
const { checkConformance } = options;
const response = makeMsgResponse();
try {
response.result = await lazy.ManifestObtainer.contentObtainManifest(
this.contentWindow,
{ checkConformance }
);
response.success = true;
} catch (err) {
response.result = serializeError(err);
}
return response;
}
/**
* Given a manifest and an expected icon size, ask ManifestIcons
* to fetch the appropriate icon and send along result
*/
async fetchIcon({ data: { manifest, iconSize } }) {
const response = makeMsgResponse();
try {
response.result = await lazy.ManifestIcons.contentFetchIcon(
this.contentWindow,
manifest,
iconSize
);
response.success = true;
} catch (err) {
response.result = serializeError(err);
}
return response;
}
}
/**
* Utility function to Serializes an JS Error, so it can be transferred over
* the message channel.
* FIX ME: https://bugzilla.mozilla.org/show_bug.cgi?id=1172586
* @param {Error} aError The error to serialize.
* @return {Object} The serialized object.
*/
function serializeError(aError) {
const clone = {
fileName: aError.fileName,
lineNumber: aError.lineNumber,
columnNumber: aError.columnNumber,
stack: aError.stack,
message: aError.message,
name: aError.name,
};
return clone;
}
function makeMsgResponse() {
return {
success: false,
result: undefined,
};
}
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